According to the explanation given in the previous question, now we have an alpha decay, which is similar to a beta decay, but now the result will have the new element being produced and an alpha particle, which is the same as a Helium atom being released:
For Uranium 234:
234/92 U ---> 230/90 Th + 4/2 alfa
Thorium 230 will be produced
For Radium 223:
223/88 Ra ---> 219/86 Rn + 4/2 alfa
Radon 219 will be produced